View Compilation Error

0_0_35850118_419\Main.java:20: 错误: 未结束的字符文字
                             System.out.print('2^'+a+"mod");
                                              ^
0_0_35850118_419\Main.java:20: 错误: 未结束的字符文字
                             System.out.print('2^'+a+"mod");
                                                 ^
0_0_35850118_419\Main.java:20: 错误: 不是语句
                             System.out.print('2^'+a+"mod");
                                                ^
0_0_35850118_419\Main.java:20: 错误: 不是语句
                             System.out.print('2^'+a+"mod");
                                                    ^
0_0_35850118_419\Main.java:20: 错误: 需要';'
                             System.out.print('2^'+a+"mod");
                                                          ^
5 个错误